Sep
03
2009

An electromagnetic gun: What's it for shooting? Disks, mostly.
An electromagnetic gun: What's it for shooting? Disks, mostly.Courtesy ScienceApe
Oh, you thought I forgot about the Geoengineering Extravaganza I promised, after just one entry? Did JGordon forget? Or is he just demonstrating a tremendous lack of respect for the Science Buzz audience?

Neither, respected friends, neither. First of all, I’ve never forgotten anything in my life. (This is in case anything I do eventually relates to someone else owing me money.) And I think I’ve demonstrated my respect for y’all over the years.

No, what happened was this: on Tuesday evening, my sock caught on a nail sticking out of my kitchen floor, and I went down like a redwood. Dried or decomposing pieces of food cushioned the fall for most of my body, but I’m afraid my face landed squarely in the mousetrap, which I had just baited with fresh poison. Luckily the trap pinned my lips shut before I ate too much of the poison, but I mix some potent poisons, and it only took a little to put me out.

My poisons are designed to remove a mouse from consciousness for anywhere from a week to several months, long enough for me to shave them, and ensure that they wake up somewhere frighteningly unfamiliar, like Thailand, or inside of someone recovering from major surgery.

At any rate, I was out for almost all of yesterday. It’s good that I woke up when I did, because I was covered with mice, but I’m afraid I just never found the opportunity to do another geoengineering post.

Until now.

So, let us continue with the “forget about the greenhouse gases, and just cool this place off, now!” theories. That is, those theories that could reduce the amount of absorbed heat (from the sun) rather than reduce what’s storing the heat (greenhouse gases). It’s called solar radiation management, and it includes a wide range of potential projects. And I shall now introduce you to several, starting with the most weaksauce of them, and moving on to something with giant space guns.

When I call something “weaksauce,” I don’t mean to imply that it’s a bad idea, only that it doesn’t involve huge guns, or giant sulfur-spewing zepellins. Sort of like how cool roofs are weaksauce. Cool roofs have come up on the Buzz before. The idea is that by simply having lighter-colored roofs, more sunlight and heat is reflected back away from the Earth. And, aside from the planet heating up a little less, your house heats up a little less too, so you don’t have to use as much energy on air conditioning, and the power companies don’t have to burn as much coal, etc. Pretty neat, huh?

Unfortunately, it’d be pretty tricky to get enough people to have reflective roofs for it to make much of a difference to global temperatures—otherwise the cooling would just be local, and who cares about that, right? Plus… no giant guns, or anything.

Not like the plans to build a sunshade in space. They have guns.

Remember that season finale episode of The Simpsons, where Mr. Burns built a giant metal shade to block the Sun from Springfield? I hope you do, because some scientists are actually proposing something like that, but on a larger scale, and in space. Like, massive mirrored satellites. Or there’s the plan mentioned in this Atlantic article (which I’ve linked to before)—A professor at the University of Arizona proposes building 20 giant electromagnetic guns (rail guns?), each more than a mile long, with the purpose of firing Frisbee-sized ceramic disks into space. Each gun would fire 180,000 disks a minute, 24 hours a day, for 10 years. At that point, there should be enough disks suspended “at the gravitational midpoint between the Earth and the Sun,” that sunlight headed toward Earth would be significantly scattered… lowering the planet’s temperature. Unfortunately, the technology for these guns doesn’t exist, it would be really expensive, and it would kind of last forever. Also, one gets the feeling that this professor is just trying to make a point. On the other hand… giant disk guns.

And then there are the middle ground plans, like cloud enhancement. The idea there is to make the clouds puffier and whiter by blasting seawater up into the air with special ships. These nice, white clouds would, again, reflect more sunlight away from the Earth, cooling things down. It shouldn’t last forever, and who doesn’t like puffy white clouds? Unfortunately, it ain’t cheap, and as with all most of the other solar radiation management plans, we don’t know exactly what all the repercussions would be. Clouds are just clouds, right? Yes, but clouds affect how much rain we get, and who gets it, and how much plants photosynthesize, and so forth and so forth. And the plan is slightly less gunny than the space-sunshade thing.

Next time we’ll move on to “carbon-removal projects.” But right now I have to get the taste of mouse blood out of my mouth. (It’s an ingredient in the poison.)

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